What challenges did many vietnam veterans face when they returned to the united states after 1971? check all of the boxes that apply.

Unemployment

Physical injuries

Mental injuries

Haunting memories of war

Substance abuse

Unemployment

Physical injuries

Mental injuries

Haunting memories of war

Substance abuse

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.