According to the YouTube documentary entitled, "Commanding Heights $-$ The Agony of Change," what exactly did both Margaret Thatcher $($Great Britain$)$ and Ronald Reagan $($United States$)$ do during the $1980$s that played an instrumental role in helping most of the planet convert from the failed economic systems of socialism and communism to a capitalist $/$ free market $/$free trade model?

Multiple Choice

$$ They both made a deal with the United Nations that the U$.$S$.$ and Great Britain would donate billions to the UN if they helped to convert developing countries to adopt the ideas of free market capitalism and free trade.

$$ Both national leaders went on an international speech campaign around the world to promote the ideas of personal liberty, free trade, and entrepreneurial capitalism. Both of them especially targeted Eastern Europe, which ten was under the repressive rule of the old Soviet Union.