Before WW1 nations started building up their military because they thought that having a stronger military made them great. This led to Germany trying to show off its naval power which scared England so they began building their navy. All of this led to countries becoming more and more suspicious of each other which then made war likely.
So as nations built up their armies other nations began to feel threatened.
For future reference it would be more beneficial to give options when asking your questions.
A word which means an excess of or an abundance in supply is surplus.
But I think the answer you ware looking for is surfeit, which is also a synonym with the same meaning!
Hope this helps, if you need anymore help or need further explanation just let me know!! :)
The answer could be :It all happened so suddenly.
b: forcing the reader to infer from earlier material what the phrase means
Explanation: Certain truths referring to the assertion made in paragraph 2
Sample, case, instance, illustration.