Context: A key aspect of the Gates Foundation's U.S. efforts involves an overhaul of the country's education policies at both the K-12 and college levels, including support for teacher evaluations and charter schools and opposition to seniority-based layoffs and other aspects of the education system that are typically backed by teachers' unions. It spent $373 million on education in 2009. It has also donated to the two largest national teachers' unions. The foundation was the biggest early backer of the Common Core State Standards Initiative.

Question: what is a key aspect of the gates foundation in the US
Answer: A key aspect of the Gates Foundation's U.S. efforts involves an overhaul of the country's education policies at both the K-12 and college levels

Question: What do these efforts include
Answer: including support for teacher evaluations and charter schools and opposition to seniority-based layoffs

Question: how much did it spend in 2009
Answer: It spent $373 million on education in 2009.

Question: It was an early backer of what 
Answer: The foundation was the biggest early backer of the Common Core State Standards Initiative.

Question: How much did teachers' unions spend on education in 2009?
Answer: Unanswerable

Question: What is a key aspect of the Common Core State Standards U.S. efforts?
Answer: Unanswerable

Question: What group has donated to the two largest national charter schools?
Answer: Unanswerable

Question: What did the Gates foundation spend on support for teacher evaluations in 2009?
Answer: Unanswerable

Question: What were teachers' unions the biggest early backer of?
Answer: Unanswerable