please can you answer this question?

[1] On what three bases can the government confiscate property from private parties? [2] Government-confiscated property is likely to be liquidated using what commercial channel? Why? [3] To build Trump's border wall with Mexico required the U.S. government to seize private property of individuals owning property astride the border with Mexico. On the basis of what legal theory are such takings of property effectuated