<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwkA" rel="mw:WikiLink" title="World War I">World War I</a>: The United Kingdom and the <a href="https://en.wikipedia.org/wiki/British_Empire" id="mwkQ" rel="mw:WikiLink" title="British Empire">British Empire</a> declare war on <a href="https://en.wikipedia.org/wiki/Austria-Hungary" id="mwkg" rel="mw:WikiLink" title="Austria-Hungary">Austria-Hungary</a>.