Has there ever been a border longer than US/Canada?

Or, worded differently, are there examples in history of two huge nations coexisting the way US/Canada do (without one dominating the other...hockey jokes aside)?

The lasting image of WWI seems to have been the trench warfare that dragged on for 4 years. However, the Germans seemed to have advanced rapidly toward Paris from August-September 1914. What were infantry tactics on the Western Front like prior to the Battle of the Marne (during this "opening" stage of the war where mobile warfare was still widespread)? What did these early battles (Leige, Namur, Mulhouse, Haelen, Charleroi, Mons, etc.) look like? Were there battalions of men moving to meet the enemy or was it more like strings of men spreading out and engaging in small unit tactics? Did these battles reflect the same type of combat that was used during the 1870 Franco-Prussian War or had tactics changed since then?

In essence: I don't have a clear picture of what infantry warfare looked like in the late 19th/early 20th century prior to the trenches of WWI. I took a military history course back in college, but everything was talked about at such a high level; boxes and arrows symbolizing entire armies advancing, meeting, and retreating on a map... I never knew what was actually happening on the ground during a battle. Pictures/diagrams would be great too.

This may sound ignorant, but I do not understand why Korea was under subject for the rivalries of the the US and Russia.

Japan seemed more of a likely target to divide as it was much more industrialized and richer comparably to the economically poor Korea.

Sorry if I sound silly, history isn't my forte.

Between his involvement in the Spanish Conspiracy to the Burr Conspiracy, Wilkinson was receiving money secretly from the Spanish Crown while acting on behalf of the U.S. What exactly was his endgame for all of this?

It seems strange to me that from all the possible flavour complimenting substances available, salt and pepper are the two that are most frequently used.

The famous ones that are thought to be lost. Are they most likely traded in some underground market? Or handed down from generation to generation?

Did Martin Luther nail them up on October 31st of the Gregorian or of the Julian calendar? My guess based on other things I have been reading (including on this subreddit, but I want to be absolutely certain) is that it was the Julian Calendar, in which case it really happened November 10th by the Gregorian Calendar. Can someone set me straight on this? I'm writing something on my blog about it.

Every time I read on some historical figure or other, I always end up checking out their children and their children's children, but it always ends in a couple sentences of mayhaps and possiblies. Made harder because inevitably, someone had a daughter, and no one wrote about them unless they married somebody important.

Is there a family line we can reliably trace from a well known ancient figure? Ceasar or maybe one of the Chinese dynasties? And how did we manage to do that, since record keeping seems to have been spotty?

I'm trying to research whether language to the point of self-awareness is what causes consciousness. Hellen Keller reports in "the world I live in" that "When I learned the meaning of 'I' and 'me' and found that I was something, I began to think. Then consciousness first existed for me...I cannot hope to describe adequately that unconscious, yet conscious time of nothingness"

I was hoping somebody could tell me if there ever been cases similar to hers who report similar or contradictory experiences?

I know that comedy and drama are both very old genres in theater, dating back to ancient Greece at least, and it seems likely that film borrowed from those genres in theater. However, I'm not familiar with any theater performances that would fall under the horror genre. The only things I can think of that films might have borrowed from are books like Frankenstein. So were there precursors to horror on the stage or did film draw from other sources?

I've done a bit of googling and the clear answer seems to be ww1 for cover against gunfire but more importantly cover from artillery.

I would imagine it wasn't used too far back due to inaccuracy of firearms but am just curious for solid answers instead of my uneducated speculation.

So I guess, when did they first become a prominent tactic and what changes in weaponry caused this tactic to be used?

This is a fascinating subject to me, and I've recently realized I know little to nothing about it's history and origins. I didn't find anything in the book list.

This is something I've always wondered. In America, you had a massive, advanced trade of people as commodities, rooted in the plantation system. Why was it that such a system didn't exist elsewhere? Even in South America, it seems like that's not something that spring up quite as successfully. Was it agricultural space? Economic reasons? Moral reasons? Do we have to go as far back as a Roman latifundia to see a real analogue?

I don't know if this is a recent concept or if the suit is just a modern representation of an old one, but when did the devil become the silver tongued businessman in a pinstripe? Specifically, when did we start thinking of him not as the ruler of some underworld, great evil, or a tormenter, but rather as someone who writes contracts and make clever use of legalese?

I know the idea of pacts has existed for a for some time, and the idea that he's a great deceiver even longer, but there seems something particularly modern and distinct about contracts and the willingness to adhere to them.

Even though Rome had been technically Christian for a century or so prior to its collapse (western empire at least). I assume it would have still been some time before Chrisitianity was universal around the empire?

Were any peoples or groups known to have held on to the belief in the roman deities post-collapse?

Not physical love as in sex, but as in, caring for someone.