Each State would select representatives, and then those people would go and vote for senators
The 17th amendment allows voters to elect senators by popular vote. Before this amendment senators were elected by state legislature not the people.
Originally before the passage of the Seventeenth Amendment the Senators of the Senate were elected by the legislatures of their respective states. After the Seventeenth amendment was passed the Senators were now elected by the Citizens of United States.
After the ratification of the Seventeenth Amendment in 1913, Senators are by law directly elected by the voters in their respective states. Before 1913 it was up to the states to decide how they would choose their Senators. Some were directly elected, some were chosen by State Legislatures.
The seventeenth amendment to the US constitution, which was ratified on May 31, 1913, made it so that senators would be elected directly to the senate by voters. Before this Senators were appointed by the state legislators (Legislators from Delaware would choose the Senators for Delaware etc.). Before this only the representatives were directly elected. The amendment was one of the parts of the platform for the populists and later, the progressives.
The Seventeenth Amendment to the Constitution, which became law in 1913, provided for the direct election of Senators by voters. Before then, United States Senators had been elected by vote of the State Senators of the individual states.
The 17th Amendment to the U.S. Constitution, ratified on April 8, 1913, changed who elects U.S. Senators. From 1788 until 1912, each U.S. Senator was elected by the state legislature. Since 1914, each U.S. Senator is directly elected by the people of the state. Some states were appointing their U.S. Senators based on the popular vote for several years before the Amendment was ratified.
State legislatures
Before the passage of the 17th Amendment, U.S. senators were elected by members of the individual state legislatures.
Each state legislature would elect two senators to 6-year terms
They can only be reelected once. This restriction appears in the 22nd Amendment to the Constitution. Before this amendment was ratified, there was no limit on how many terms a president could be elected to serve.
Before the 17th Amendment, members of the House of Representatives were elected directly by the people, but members of the Senate were elected by the individual states' legislatures. However, the 17th Amendment changed the election of Senators from the state legislatures to the people. As a result, senators are now directly elected by the people.
Before the Twenty-Second Amendment, Presidents could run again for a 3rd term. The Congress passed the amendment on March 21, 1947.