First, the United States is not an empire (although some will argue it is functionally acting like an empire). The United States has not sought to increase its territory or direct political control in the last century (although, again, some will argue that indirect political control amounts to the same thing).
The major difference is that the United States mostly wants other countries to run themselves, albeit in accordance with what would make the United States happy. Also, the United States tends to espouse the idea that they will "defend democracy" and support human rights through war (which some will argue results in causing the exact problems that the war was supposed to stop). Previous empires have specifically focused on directly controlling additional land and people by annexing independent countries into the governing structure of the empire.
Imperialism
I want know the defference between present policy of foreign investment and past policy of foreign investment
Policy is a noun and therefore cannot have a "past tense". Policy is a derivation of political management and could potentially be associated with the verb "to police", though the connotations in English tend to differ.
The 39th president, Jimmy Carter, based much of his foreign policy on human rights. He refused to continue past practices of overlooking the human rights abuses of our allies.
Differed.
past
Past
it is bigger
No difference no brains in the past no brains today
Morris Goldstein has written: 'The global effects of fund-supported adjustment programs' -- subject(s): Economic conditions, Economic development projects, Economic policy, International Monetary Fund 'The Asian financial crisis' -- subject(s): Financial crises, Foreign exchange, Government policy, International Monetary Fund, Stock exchanges 'Coping with too much of a good thing' -- subject(s): Economic policy, Capital movements 'Jesus in the Jewish tradition' 'Policy Issues in the Evolving International Monetary System' 'International Capital Markets' 'The exchange rate system and the IMF' -- subject(s): Foreign exchange administration, International Monetary Fund 'Have flexible exchange rates handicapped macroeconomic policy?' -- subject(s): Foreign exchange rates, Economic policy 'Safeguarding prosperity in a global financial system' 'Controlling currency mismatches in emerging economies' -- subject(s): Foreign exchange rates, Foreign exchange administration, Monetary policy 'The Exchange Rate System: Lessons of the Past and Options for the Future'
Pie did.
The past tense of "differ" would be "differed".