Nearly 4,000,000 American participated in world 1 and —— would lose their lives fighting in the war

there were abundant sources of fuel nearby

the main reason that the constitution did not proclaim all men to be free and equal is because of the issue of slavery.

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.