Answer:
You might report this answer but you did name anything so i cant answer your question. sorry
Explanation:
Historians find it beneficial to base certain research on historical themes analysis because the same themes apply to people living in quite diverse ages and places.
<h3>What is research?</h3>
A method of disciplined investigation that includes gathering data, documenting information, then analyzing and interpreting that data/information using procedures established by certain professional professions and academic disciplines is known as Research.
Historians are scholars who explore and write about the past using original sources. They come to their own conclusions.
They must conduct detailed research of historical topics in order to obtain reliable information about the past, which can be accomplished by comparing resources from similar time periods and locations.
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The German U-boats was detected through sonar. <span>Allies used sonar</span><span> to detect submerged warships such as the U-boat, which cannot be seen through eyes. But it can only detect those that are under the waters and not on the surface. </span>
They sought better job opportunities by going to the cites that were found on the Northern part of the Unkted States.