It was Albert Einstein who signed the letter.
It enabled those two powers to partition Poland between them. It basically paved the way for the joint invasion and occupation of Poland that September. By signing the agreement, Hitler avoided the threat of a major two-front war.
Answer:
D. Analyzing historical sources
Explanation:
In order to understand well what historical sources are, it is necessary to know that the word "source" here is understood in the sense of "document", that is, something that records the testimony of some event that occurred in the past . In this sense, historical sources or documents are all that human beings have produced in the past, such as the letter the historian found.
As the historian is translating the letter and finding historical details and evidence, we can conclude that the historian shows ability to analyze historical sources.
In antiquity, systems of measurement were defined locally: the different units might be defined independently according to the length of a king's thumb or the size of his foot, the length of stride, the length of arm, or maybe the weight of water in a keg of specific size, perhaps itself defined in hands and knuckles.
Systems of Measurement: there are two main systems of measurement in the world: the Metric (or decimal) system and the US standard system. ... The US Standard system uses units that have no predictable relationship to each other. For example, there are 2 cups in a pint, but 4 quarts in a gallon.
Assembly line I believe is the right answer hope it helps!
