What invaded the northern india and established an indian empire

The Maurya Empire (320-185 B.C.E.) was the first major historical Indian empire, and definitely, the largest one created by an Indian dynasty. ... In the wake of Alexander the Great's invasion of northwest India, one Chandragupta Maurya took over Magadha and created the Maurya Empire.

The Treaty of Versailles did, however, include one of Wilsons proposals: the establishment of a world organization to provide a system of collective security for all nations; this organization came to be known as the League of Nations. The U.S. Senate refused to adopt the treaty or join the League of Nations

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