Was the United States considered formidable military force (around the time of the US Civil War) by its European contemporaries?

by LonghornNaysh

How did the US military compare to the major world powers of the mid 19th century?

Georgy_K_Zhukov

You might be interested in this previous AMA we hosted with /u/MSomervi_UK where he discusses some of this in the context, specifically, of the British Army.