Answer:
A. Building missions to convert American Indians to Christianity
Explanation:
A) Road development made canals obsolete and rarely used.
The entrance of West Germany into NATO was the final step in integrating that nation into the defense system of Western Europe. It was also the final nail in the coffin as far as any possibility of a reunited Germany in the near future. For the next 35 years, East and West Germany came to symbolize the animosities of the Cold War. In 1990, Germany was finally reunified; the new German state remained a member of NATO.
Answer: To allow trade and transportation. To provide easy access to food and drink. To grow crops in rich, fertile soil.
Explanation: Rivers have fresh drinking water and the areas near them are fertile and fit for agriculture.
Trench warfare
Probably the most important was the introduction of high explosive shells, which dramatically increased the lethality of artillery over the 19th-century equivalents.