They started more war fronts and then tried Ariel attacks.
Explanation:
The trenches were an invention during the time of the first world war when the soldiers began to dig into the fields and fight from them instead of open pitched battle which was common in the time.
The trenches were thus marked as the end of the fast paced war as both forces had defensive portions on the turf.
This was to be worked around by using more war fronts to surround and bypass the trenches as well as ways to mount the other trenches and overtake them.
The correct answer to this open question is the following.
Although you forgot to include the text or reference to know who "they" are in your question, we can comment on general terms.
Based on my early studies, I think people's lives changed as a result of the Industrial Revolution in that society completely changed the way goods were produced or manufactured.
Indeed, the Industrial Revolution changed the way of many people. Farmers who lived in the rural parts of the country decided to move to the larger cities such as New York or Chicago, where the big factories were located. Immigrants from Europe and Asia decided to move to the United States to work in the factories. There, people were hired to operate the machines in the mass production system. They earn low salaries and worked under unhealthy and risky work conditions.
They respected Native territories, their ways, and treated them as the human beings they were. The Natives, in turn, treated the French as trusted friends. More intermarriages took place between French settlers and Native Americans than with any other European group.
BRAINLIEST PLSSS