By the 1830s British free trade policy unleashed a flood of opium in China, which threatened China's:

Who introduced arabic numerals to italy, which make bookkeeping possible? a. brunelleschi b. cosimo de medici c. fibonacci d. gregory xi e. giovanni de bicci de medici

What ideas, institution, and causes became the focal points of chinese and islamic resistance respectively to the west in the latter half of 19th century and the first decades of the 20th

Which of the following is/are a major technological advances of the mayan civilization? a. the calendar c. math b. architecture d. all of the above