After WW1 the only land the Ottomans had left was Turkey. The Greek tried to invade Turkey and Mustafa Kemal drove the Greek out and became the first president of the Republic of Turkey.
Gandhi used non violence and civil disobedience to solve the Indians problems. He encouraged people to make all their own clothes which brought down British sales and he led the Salt March so they wouldnt have to buy salt from the British.
The Second Battle of the Marme the Germans were defeated and the Central Powers began to crumble. Kaiser Wilhelm stepped down and the new representative for Germany signed an armistice with France which stopped the fighting.
The Germans had a pact with the Americans that promised they wouldnt use unrestricted submarine warfare, so when the Germans broke the pact, the US entered the war.