Why did pioneers finally decide to settle in the great plains

In North America, the land grants were typically 1/4 section, or, 160 acres. So, this looked really good to immigrants most of whom could only dream of owning land back home. 

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict