2historians follow rules to them analyze
primary sources. some of the rules they use are:
• every piece of evidence and every source must
be read or viewed skeptically and critically.
• each piece of evidence and source must be
cross-checked and compared with related sources
and pieces of evidence.
—library of congress
these rules are designed to historians
determine the
(1) reliability of document information
(2) popularity of a publication
(3) differences in belief systems
(4) laws of a civilization

Read the opening line from a draft of an informative essay. which is the best revision of the sentence? trade between great britain and japan expanded as opium deals between the nations increased in the early 1800s. britain greatly expanded trade with china, increasing its opium exports more than five times in the early 1800s. britain’s expanded trade in opium led to export increases that were five times greater in the early 1800s. britain greatly expanded trade with china, which increased its opium exports more than five times in the early 1800s.

In shifting to a defense policy based upon the concept of "flexible response," president kennedy was indicating that he had grave doubts about thevalue of which previous defense policy? a massive retaliationb collective securityc containmentd air power

Which is an example of a country that is overly dependent on another country for goods and sevices