What if China, Afghanistan, and Romania were to have joined the central powers?
The Sino-German cooperation had been signed in 1911. Germany had proposed a German-American-Chinese entente in 1907, but it failed due to how obviously stupid it was. Germany also gave a 6 million German Goldmark loan to Republican China in 1912.
King of Romania was staunchly pro-German (though the queen wasn't). King Carol wanted to join the Central powers.
In WW1 the Afghans were already lined up on the Indian border, but the Emir was paid off by the British.