What was one of the main drivers of economic growth?

The best three are:

1) Oil at $60 per barrel will stem worker layoffs and revive the energy sector while stimulating further economic growth.

2) Corporate earnings are improving with more upward revisions and upside EPS surprises, evidence that the weakness in the first quarter was only temporary.

3) April's jobs report was a positive sign that the economy is still healthy while additions in the construction industry shows strength in consumer demand.