The jungle terrain and bad weather made it difficult for the American forces fighting in Vietnam. This is because it allowed the Vietcong to successfully use guerrilla warfare strategies and to lay traps. Later, tunnels were found under the jungles which helped them avoid bombs
it would be the development of Vaccine
For example, Before vaccine was invented, many people in Europe died from small pox. Approximately, small pox alone took around 400,000 of European people each year. (to understand how bad it is, it's important to know that their total population at that time was so small compared to the current population)
The development of vaccine prevented European people during industrial revolution from infected from many type of illness that could easily harm them due to lack of knowledge to treat them.
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Explanation:
although the ancient roman civilisation was not an emmpire until its last few centuries of rule,it is still regarded as one of the greatest empires
i guess this is the answer
I believe your answer is mass...
Answer:
From 1930 to 1940, the number of employed women in the United States ... “Women were more insulated from job loss because they were ... New Deal increased demand for secretarial roles that women rushed to ... as 'birds of passage' coming here do jobs American didn't want to do.
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