Which is the first official contest for presidential candidates seeking their party's nomination?

The appropriate response is Iowa Caucuses. It is a discretionary occasion in which inhabitants of the U.S. territory of Iowa meet in area gatherings in the majority of Iowa's 1,681 regions and choose agents to the relating traditions in each of the state's 99 provinces. These area traditions at that point select representatives for both Iowa's Congressional District Convention and the State Convention, which in the long run pick the agents for the presidential choosing traditions.