The 5th Amendment states that the government may obtain private land and use it for public projects, so long as they offer fair compensation to its owner. This is known as

The Eminent Law of Domain

Explanation:

This comes from the so-called "Takings Clause" of the Fifth Amendment. It states "[N]or shall private property be taken for public use, without just compensation." The men who created the Constitution were, for the most part, landholders with a certain mistrust of the federal government.

it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.