Why would a historian think there was not enough evidence about the railroad workers being on strike?

Because if he will say there are evidence about that that would be a civial war.

The correct answer is C. Each branch of government has power over the others

Explanation:

Checks and Balances was a principle of government that separated the power into three branches, the legislative, the executive and the judicial. Also, it provided specific powers and roles to each branch as wells as power over the others, this is aimed at avoiding only one branch to hold all the power and creating a system in which power branches regulate and check each other to avoid any issue related to power. Thus, check and balances ensure the power is divided into branches and each of it has power over other branches.