How did the french and indian war affect the british and ultimately the colonies?

Utterly changed everything.

Prior to this war the colonies were entirely dependent on Britain for security from indians and french. It is when these were defeated the colonists turned on their protectors.

Almost every thing about the US foundation myth is false.

The French believed in divine right of kings and dictated from france everything about their Canadian colonies. All positions went to nobility based entirely on court influence. The very large nobility and church did not pay tax. Only peasents paid tax. This caused the french revolution s few years later.

The british had abolished devine right of kings in 1689, had a limited form of parliamentary democracy and allowed the colonies to self govern. All british people paid tax , The richpaid most, the colonists paid least.

In the french indian war the American colonist outnumbered the french colonists 10 to 1 but most refused to fight and left the fighting to the British regulars. George Washington was an exception.

Unfortunately the American schools and museums teach a Disneyland version of the above. Anybody who challenges the false narrative is disbelieved.