What are some bad things about nationalism? examples?

What is it called when countries build lots of weapons to store and them in case of a war?

In the years after world war ii, which of the following caused many people from asian and african countries to migrate to europe? a. the end of the soviet union b. new economic opportunities after colonialism ended c. the religious freedom found in europe d. new laws allowing greater numbers of immigrants into european countries

Which of the following events most directly contributed to the establishment of israel as a nation