Explain the effects of
technological advances
in the development of the
united states over time.

d

explanation:

i think that this is the best answer, but im sorry if this is wrong

i thinl it is the 1st answer

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.