In the us government citizens play a key role in

Elections

Explanation:

The United States is a representative democracy, which means that the citizens of the country have the right to participate in politics by electing representatives. Therefore, the most important and significant role that citizens play in American politics is that of participating in elections. Citizens play a key role in elections because this is the moment when they are able to deeply influence politics by choosing representatives that closely align with their beliefs and interests.

by 1880, germany had more rail lines than great britain and russia.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.