The most economical really powerful country
the untied states
As of June 2014, DeAndre Yedlin plays for Seattle Sounders FC, a club in United States.
I believe it is the United States
The United States of America has a relatively free-market capitalist economy. As with all capitalist systems, the government plays a significant role in providing public goods, infrastructure, a social safety net, and large expenditures for pure research and development. The vast majority of commercial enterprises are privately-owned and operated for profit in a market economy.
Because it is not the United States of America
The Toronto Blue Jays.
Alejandro Bedoya plays as a Midfielder for United States.
Omar Gonzalez plays as a Defender for United States.
Matt Besler plays as a Defender for United States.
John Brooks plays as a Defender for United States.
DaMarcus Beasley plays as a Defender for United States.