Answer:
Coal, nuclear, and petroleum.
The correct answer to this open question is the following.
During the times of NAFTA, the North America Free Trade Agreement between México, Canada, and the United States, many people opposed the treaty and questioned President Bill Clinton about it.
Nader and Buchanan opposed the ratification of NAFTA. This influenced what Clinton said in his speech of September 14, 1993. On that day, President Clinton signed two supplements that were included in the Free Trade Agreement.
President Clinton’s speech addressed the arguments against NAFTA that Nader and Buchanan made in that hehe said it was not true that the trade meant just moving out jobs from the US to México. And he clearly explained that Mexicans with lower income than Germans or Europeans spent more in US products, more than those Europeans and Canadians.
They were searching for cities of gold called cibola
