Because they were only interested in themselves
The correct answer is an experiment.
An experiment refers to an investigative study, where a researcher scientifically tests a hypothesis. Specifically, a researcher tests the effect an independent variable (manipulated variable) on the dependent variable (outcome), to investigate whether there is a causal (cause and effect) relationship between the variables. For instance, if a researcher wants t<span>o determine a cause and effect relationship between alcohol consumption and driving ability, he or she would use an experimental research study to do so. </span>
Carl von Clausewitz was a Major General and military theorist born in Prussia. One of his most famous writings was Vom Kriege.
Yes it is the oldest in U. S. history in 1778
