Yes, nightcrawlers- the big worms- are an alien invasive.

There's a classic on this topic, William Cronon's Changes in the Land, which goes into great detail about this very thing.

Forests were then as much governed by soil type and climate as they are now. Maple and beech were , like now, common in places with relatively acidic soils. Pines did better in places with sandy poor soils. Soil types have not changed much. There were some notable invasive plants quite early: plantain was called "White Man's Foot" by the Indians. Moose and the Eastern Buffalo would be found down into New England. Caribou, though, are more adapted to tundra life.

Indians would also have an effect on the forests. They were perfectly happy to set fires and burn out the underbrush, to make it easier to hunt, and these could become big burns, which could also create large meadows ( which also supported more edible wildlife) .

There's also the simple fact that wood was a resource and the Europeans could exploit it, for building and heating. Complaints about shortages of firewood were happening even in the 17th century. Perhaps that is the biggest change in New England- from heavily forested before 1617, to less and less forested until 1850, then more and more forested until now.