The Nazi-Soviet pact was put into place before ww2 was in full swing because hitler didn't want to fight a two front war, but he attacked russia and got as far as Stalingrad then his army was encircled and cut off. He then had to fight a two front war
They must research, read and explore using multiple different resources to look at and explore the past history.
The approach which allows the decisions of various eras to result in a long-lasting impact on the present scenario is the historical research approach.
<h3>What is meant by research?</h3>
Research is the process to find out information and knowledge about any topic or concept from every possible source.
Historical research is a qualitative approach that focuses on identifying the events that happened in ancient times and interpreting the facts and reasons for their occurrence. This study helps in analyzing the impacts of past events on the current scenario.
Therefore, the historical research approach is the one that allows us to study the impacts of different eras on the present lives.
Learn more about the research in the related link:
brainly.com/question/18723483
#SPJ1
Answer:
The Nazis began experimenting with poison gas for the purpose of mass murder in late 1939 with the killing of patients with mental and physical disabilities in the Euthanasia Program.