Simple answer irrigation system.
Want more information use this source:
https://en.m.wikipedia.org/wiki/Neolithic_Revolution
As the same themes apply to people living in very different times and places, therefore, It is useful for historians to base certain studies on the analytics of historical themes. The correct option is B.
<h3>
Who is called a historian?</h3>
The individuals who research and write approximately the beyond and for that, they do enormous studies from the quality sources available and draw conclusions from them are referred to as Historians.
To have the correct records about the past they need to do detailed research of the historic issues that may be carried out thru the assessment among the useful resource of the similar time frame and places.
The missing information in the question is as follows:
A. There are fewer historical themes than there are regions or periods.
B. The same themes apply to people living in very different times and
places.
C. All the cultures in a particular region respond to historical themes in the same way.
D. Experience has confirmed that analyzing themes is the most effective approach to history
Thus, The correct statement for the above question is Option B.
Learn more about historians:
brainly.com/question/24466312
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<span>The stock market crash of 1929 was not the sole cause of the Great Depression, but it did act to accelerate the global economic collapse of which it was also a symptom. By 1933, nearly half of America's banks had failed, and unemployment was approaching 15 million people, or 30 percent of the workforce.</span>
the answer is c, atomic bombs.
B. Native Americans
The way how most of the expedition acted around the Native Americans were drastically different from other settlers. The Expedition tried to build up US and Native American relationships, while most of the settlers just wanted to take advantage of the Native Americans and get as much benefit as possible.
The reason for this is the Lewis & Clark expedition was the pathway to the westward expansion, for they brought the news that the land to the west is good for settling
hope this helps