Which historical event most caused the US urban population to climb from 6 million to 44 million between 1860 and 1910?

Woodrow wilson called the supreme court "a constitution convention in continuous session." what did wilson mean by this?

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

What are the 6 steps in the scientific method