Describe the mounds built by Caddoan cultures in Oklahoma. Why were these mounds built?

In japan, the is the head of state and the is the head of government.who ever answer will get

Which is one reason many african nations have not prospered after gaining independence from european colonial powers? a. colonial powers sent their weakest economic advisors to the new countries, and their recommendations were flawed. b. independence left them with weak economies, and many countries have been unable to overcome or recover from these burdens. c. the desert region of the interior is inhospitable to foreign investors, and business interests focused on the coastal mediterranean cities. d. the money endowed upon independence is still tied up in the bank of england, which is hesitant to make loans to struggling nations.

What is the term for a short statement about history that has not been yet been proved