What was the most important example that President Washington set for future presidents?

The most important precedent was Washington's final act as president: He stepped down after completing two terms. Pressed to serve a third, he believed that a peaceful transition of power to a newly elected president would be in the nation's best interest.

the british plans for the middle east after world war one because they wanted to control the middle east by dominating a belt of territory stretching from eygpt to iran, in which they could control the route between europe and india.