Type of government where state and a central government share power

He seventeenth amendment to the us constitution calls for the direct election of all us senators. this means that the people of each state get to vote to decide who will be their two us senators. before this, the legislatures of each state chose the two us senators from that state with no direct involvement of the average voter. why would this amendment be considered a reform? how would it benefit the people? even today some people claim that the seventeenth amendment was a bad idea. what arguments could be made for reverting selection of us senators back to the state legislatures?

What was the result on the u.s. economy because of the major changes in atlantic shipping prior to and during the war of 1812?

The ottoman kingdom began in the region of anatolia