Why were some delegates opposed to having a president to lead the executive branch

Delegates at the Constitutional Convention were worried about having an executive branch because they thought a president would act too much like a King.

This fear of having another king was a real threat to citizens when creating the US Constitution. Considering that one of the reasons why America became independent was due to a King's actions, the delegates wanted to make sure that they did not establish a similar set up. This is why the Constitution consists of a system of checks and balances. This means that the power of the president is limited both by the legislative branch (aka Congress) and the executive branch (aka the Supreme Court).

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

cuban communists pressured the soviet union to place missiles in cuba.