Sources of information can be divided in primary and secondary ones. Primary sources are first-hand accounts. They are written as a report of events that are currently happening, and are not based on other sources of information. On the other hand, secondary sources are those that are based on primary sources. They involve the analysis, synthesis, interpretation, or evaluation of primary sources. In this example, the journal would be a secondary source as it describes events that took place before the lifetime of the Indian princess.
It would be the job of the "c. the president of the United States" to uphold the supremacy clause of the United States Constitution, since this ensures the power of the federal government over the states.
