Why did the sans-culottes and the jacobins cooperate at first why did that cooperation end?

The Jacobins and the sans-culottes cooperated at first because they wanted to overthrow the current monarchy. These extreme Jacobins were called the Mountain because they were seated way up the Assembly Hall. They were more cooperative than the Girondists were.  

The cooperation ended when Maximilien de Robespierre and his now dominant Jacobin Club turned against the radical factions of the National Convention, including the sans-culottes, despite them having previously been the strongest supporters of the revolution and its government. 

The New Deal was a set of domestic policies enacted under President Franklin D. Roosevelt that dramatically expanded the federal government’s role in the economy in response to the Great Depression. Historians commonly speak of a First New Deal (1933-1934), with the “alphabet soup” of relief, recovery, and reform agencies it created, and a Second New Deal (1935-1938) that offered further legislative reforms and created the groundwork for today’s modern social welfare system. It was the massive military expenditures of World War II, not the New Deal, that eventually pulled the United States out of the Great Depression.

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