What a was a key factor that helped lead to both the Great Depression of the 1930s and the economic recession that began in 2008?
O Americans were spending too much money that they didn't have.
O Americans were going to too many jazz concerts.
O Business was booming and profits were distributed equally among workers and managers.
The United States was involved in a costly war at both times..

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

the answer is a. hope this

i guess so you did not explain the answer clearly so i can't