What percentage of colonists were:
loyalists:
patriots:
neutral:

Google says:

20% were loyalists

45% were Patriots

And there was no info. on neutralists, but suggesting there were only 3 groups, and Patriots and loyalists were 65%, then neutralists are 35%

2. a land bridge connected asia and north america thousands of years ago.

4. crossing the land bridge would have been simple for the first migrants.

5. people might have crossed a land bridge while hunting animals.