They were in the United States' backyard, and in some cases under her direct protection. So in many ways it was little surprise when Cuba, Haiti, Nicaragua, Guatemala, Panama and Honduras joined the war on the Allied side in 1917 and 1918. Their involvement in the war was minimal, indeed scarcely noticeable, but it was enough. It earned these small relatively powerless nations - in Haiti's case barely a functioning state - an invitation to sit alongside the Great Powers at the Paris Peace Conference of 1919 and sign the Treaty of Versailles.