China has a federal deficit of 1.5 to 2.4% of GDP. However, China is ramping up spending at the provincial and city level. China is increasing spending on high speed rail and other infrastructure.
The White House projection is for a deficit of $1.2 trillion in 2012. The 2013 deficit forecast was increased from $901 billion to $991 billion. The White House is calling for $195 billion in economic stimulus.
The CIA lists US public debt at 69% of GDP in 2011.
If China maintains 7-8% annual GDP growth that would lead to double the GDP in 2020.
The US current plans are to have 2.5% annual GDP growth.