President Obama has done a large number of things that he sees as ways to deal with the economic problems that have faced the nation during his time in office. For the most part, Obama's efforts have followed the ideas of Keynesian economics.
The most important part of President Obama's plan was his stimulus program of government spending and tax reductions. Keynesian economics holds that a country that is in a recession should increase government spending and lower taxes. Both of these actions would give consumers more money to spend. Their spending would boost the economy.
The President has also done other things that were meant to stimulate the economy. For example, there was the "cash for clunkers" program that was meant to encourage the buying of new cars. There were also programs to try to help out people who were in trouble with their mortgages.
There are many other things that President Obama has done, but these are some examples of his efforts to deal with America's economic problems.