system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Suez crisis

What was it all about? Why was it such a big deal? What impact did it have on international affairs?
gpt
in 1956, Israel invaded Egypt, using the area around the Suez canal for their own stuff, cutting it off from Egyptian use. Britain and France told both sides to end the conflict with an ultimatum. 
it was a big deal because after Britain and France issued the ultimatum, they bombed Cairo, Egypt's capital. why would they bomb the country that just got invaded? that's where the really big deal part comes in, because it was evident that the three nations had planned it all out. 
Britain and France withdrew within weeks, but Israel stayed to force some negotiations and got some of what it wanted, but not the removal of Egyptian President Nasser.

the impact it had was, essentially, making sure no Middle Eastern nation trusted Israel or any Western nation ever again. 

**EDIT** : it also did this weird thing where it pointed out the good character of president Eisenhower because at the same time that this was happening, Hungary was revolting against the Soviet Union. Eisenhower could not, in all good conscience, approve Britain and France's intervention in the Middle East, and condemn the Soviet Union's intervention in Hungary when both wars started and ended in the same span of two weeks.