The 1920 census revealed that most Americans chose to live in<span>(A) urban areas.</span>
Trilobites were rapidly evolving and widespread marine organisms that spanned a number of geologic time periods. Certain types of trilobites only appeared in specific segments of geologic time; therefore, when one of these trilobites is found, you can be certain that the rock layer it is found in is of a certain geologic age.
The Great Depression began in 1930 in the United States then later moved to other countries
Otto Von Bismarck envisioned a unified Germany that was ruled by A. a monarch.
In New York, Ohio, and Pennsylvania were under snow cover in that season
