sentence1: After the high emotion of de Gaulle's march down the Champs-Elys??es, the business of post-war reconstruction, though boosted by the generous aid of the Americans' Mar?­shall Plan, proved arduous, and the wartime alliance of de Gaulle's conservatives and the Communist Party soon broke down.
sentence2: Though the Marshall Plan was designed to help other countries, it failed to fulfill its purpose wtih the Communists.