The federal aid highway act of 1956
Answer:
D: voting in a Presidential election.
Explanation:
Registering with the selective service is an obligation, and while volunteering at a community food bank and being involved in issues on college campus is great, voting in a presidential election is a responsibility of citizens in a democracy, as by participating in a democracy you strengthen it. Democracies are systems of governments where the officials are elected by the people.
D.) United Nations, because the league of nations was ineffective and basically caused WWII
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The single main event that <span>caused the United states to become involved in world War 1 was the German sinking of the ship the "Lusitania," which contained many American citizens. </span>