Why do some people hold that the united states is more properly called a republic rather than a democracy?

"In republics, citizens have less direct control over government. ... (c) Why do some people hold that the United States is more properly called a republic rather than a democracy? In a Democracy there is no need for a Constitution, since the majority can simply change Law at a whim."

From google

The question to your answer is illinois amigo

Answer barren with few trees, in the northern hemisphere;