Was the 16th amendment ratified during industrialization, urbanization/immigration, progressivism, and imperialism

Is this statement true or false? before 1850, workers in american mines, mills, and factories were poorly paid, but their safety on the job was always protected by strict laws.

Why caused john quincy adams to write the monroe doctrine?

What was a cause of the boer war? a. conflicts between boers and bantu c. disputes over land ownership b. conflicts over water rights d. desire to control the region's mineral wealth select the best answer from the choices provided a b c d