Explain the continuities and changes in the global economy from 1900 to present?

New modes of communication—including radio communication, cellular communication, and the internet—as well as transportation, including air travel and shipping containers, reduced the problem of geographic distance.Energy technologies, including the use of petroleum and nuclear power, raised productivity and increased the production of material goods.More effective forms of birth control gave women greater control over fertility, transformed reproductive practices, and contributed to declining rates of fertility in much of the world.The Green Revolution and commercial agriculture increased productivity and sustained the earth’s growing population as it spread chemically and genetically modified forms of agriculture.Medical innovations, including vaccines and antibiotics, increased the ability of humans to survive and live longer lives.

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.