In 1900, how were the members of the United State Senate chosen?

The original Constitution had senators being picked by state legislators. The Senate was supposed to be the 'more deliberative' house, the adult supervision for the House of Representatives. In 1913 the 17th amendment went into effect, allowing senators to be elected directly by the people.

In the early 1900s the members of the United States Senate were chosen by state legislators who hand picked such members based on a qualifying process commissioned by the legislators. In 1913 onwards however, there was an amendment known as the 17th amendment which gave the rights to the citizens of the United States to choose the members of the Senate by way of election.