<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwkA" rel="mw:WikiLink" title="World War I">World War I</a>: In response to the <a href="https://en.wikipedia.org/wiki/German_invasion_of_Belgium_(1914)" id="mwkQ" rel="mw:WikiLink" title="German invasion of Belgium (1914)">German invasion of Belgium</a>, Belgium and the <a href="https://en.wikipedia.org/wiki/British_Empire" id="mwkg" rel="mw:WikiLink" title="British Empire">British Empire</a> declare war on Germany. The United States declares its neutrality.