At first, Why did the British/French not stop Germany from invading other countries?

GB and France didnt stop Germany because they were doing a political strategy called appeasement. And also the Treaty of Versailles was viewed as harsh for the leaders at the time, and the countries he invaded were happy to be back in Germany anyway. If this isn't WWII, ignore.

it is a because im a fod nigba

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration