in thinking about the similarities and differences among the empires of the early modern era, what categories of comparison might be useful to consider

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.

How does a comet change when it comes close to the sun