<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwlA" rel="mw:WikiLink" title="World War I">World War I</a>: Bulgaria <a href="https://en.wikipedia.org/wiki/Bulgaria_during_World_War_I" id="mwlQ" rel="mw:WikiLink" title="Bulgaria during World War I">joins the Central Powers</a>.