Why did britain and france end their policy of appeasement?

Britain and France were convinced to end their policy of appeasement when Hitler broke his promises from the Munich Conference and took over the rest of Czechoslovakia. They knew Hitler had to be stopped and declared war on Germany when Hitler invaded Poland.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

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