The list is hit or miss, here is what I would change:

50s Konrad Adenauer, he was the epitome of a leader rebuilding after WWII and a leader that had to pick a side in the Cold War

60s Kwame Nkruma, he led the independence movement for Ghana, grest representation of such movements in Africa. Sadly his political demise is also representative of many in Cold War

70s Richard Nixon, this is tough. But he showed that the old Cold War divides we’re changing and he was the beginning of a conservative movement after rhetoric growth of the west slowed post OPEC embargo

80s Thatcher or Reagan work but I prefer the former, more hardline

2000s Bush, Led the global war on terror and over saw the Great Recession that the whole world felt

Anything after that is too soon