The leading financier who build many corporations and became the wealthiest men in america was

John Pierpont Morgan, also known as J.P. Morgan.

Explanation:

J.P. Morgan was famous to sponsor inventors to develop their ideas. Receiving a considerable commission over the inventor's success and results, J.P. Morgan created an empire in America. He dominated corporate finance and industrial consolidation during his time, but he is most famous for the sponsoring given to Thomas Edison to create General Electric.

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.

i believe he should not do investment b