The biggest reason was the existence of the European Alliances. Countries were pulled in due to alliances with other countries The alliance system was a primary reason why many European countries were pulled into conflict. Germany, for example, was obligated by a treaty to support Austria-Hungary.
The graph would represent that system would look like this (see the attachment):
I did a presentation on this quite a while ago.
What's unalienable cannot be taken away or denied. In this case, you cannot take away one's Life, liberty (freedom) and the pursuit of happiness (t<span>he opinions held by most, if not, all Americans)</span>