On November 8, 1861, Charles Wilkes, a U.S. Navy Officer, captured two Confederate envoys aboard the British mail ship, the Trent. Great Britain accused the United States of violating British neutrality, and the incident created a diplomatic crisis between the United States and Great Britain during the Civil War.
Spoils system is a type of system in which the political party winning an election rewards its active supporters by appointment to government posts and with some other favour. This spoils system ended by the Pendleton Act. The Pendleton Act is a federal law passed by the government in 1883 by establishing the United States Civil Service Commission. It ended the spoils system of political patronage and established hiring civil servants on the basis of merit.
The early leaders of the Zhou Dynasty introduced the idea of the "Mandate of Heaven". ... The government of the Zhou was based on the feudal system. The emperor divided the land into fiefs that were usually ruled by his relatives. The nobles who ruled the fiefs basically owned the farmers who worked their lands.
In order for Trump to make that kind of executive order and decision as president he would need to go to Congress and the Congressional Courts to not only get funding for the wall but get it approved in the first place. Checks and Balances stop him from doing whatever he wants with taxpayer dollars.