SAQ Some historians think the main theme of the 1920s is social conflict. Provide and briefly explain one price of evidence that would support this view of the decade.

the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

trade

explanation:

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.

this is a good question! i'll do some research and come back when i have the answer!