Three events promoted america to declare war on Germany?

1. the invasion of neutral Belgium and stories of German atrocities in the country which shocked and outraged the Americans

2. In May 1915, a German U-boat sunk the British passenger ship Lusitania off the coast of Ireland. Over 1,000 passengers were killed, including 128 Americans

3. In 1917, Germany sent a telegram to Mexico suggesting that if the US should declare war on Germany, Mexico should declare war on the US In return, Mexico would get back the territory lost in the Mexican-American War Unfortunately for Germany, the telegram was intercepted by the British and hurriedly given to the Americans