Hitler's military strategy changed when he attacked Great Britain in such a way that C. he used heavily armed planes.
Prior to the attack, he didn't use them, but seeing that Great Britain was also a great force as much as Germany is, he changed his tactics.
Sacagawea was helpful to Lewis and Clark during their expedition in many ways. One way in particular, was as an interpreter for the Native American whose paths they crossed. She could read the landscape well and was wise in what foods were able to be eaten, used as medicine, or to be left alone.
Answer:
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When the western Roman empire collapsed in 476 AD, the unifying force for most of Europe was gone. Along with the loss of the government, much of the engineering abilities and "modern amenities" were also lost. The "barbarians" of Europe did not, for the most part, have the abilities or knowledge to build roads, aqueducts or the other marvels of the Roman Empire, which is why the period immediately after Rome's collapse is often referred to as the "Dark Ages".
The only unifying force of any sort left would be Constantine's Roman Catholic church, which did manage to preserve some of the knowledge and vestiges of the empire. As the only thing left really, it became the main power in the European world throughout the Middle Ages, functioning almost as an imperial government until Luther set off the Reformation in 1546.
