Who was the British prime minister 4 July 1776?

This was Frederick North, ennobled as Lord North. He was in office from 28th January 1770 until the 22nd March 1782, and led Britain into war against the United States during the American Revolution. He was also in office during the Gordon Riots in London in 1780, but resigned after losing a Confidence vote in the House of Commons (against the will of King George III).

He died in 1792, at the age of only 60.