Final answer:
The source 'Article 1: Convention Bosses' is likely a secondary source as it discusses historical events. For Mongol-related documents, key evidence and author perspective are important in evaluating the impact of the Mongols and assessing the reliability of sources, such as a letter from the Pope.
Step-by-step explanation:
Is the Source Primary or Secondary?
To determine whether the source 'Article 1: Convention Bosses' is a primary or secondary source, we need to consider the nature of the document. A primary source is an original document or record that was created contemporaneously with the events being described, providing direct evidence about it. In contrast, a secondary source interprets, analyzes, or summarizes information from primary sources. It seems that this article is likely a secondary source as it appears to analyze the historical development of U.S. political conventions over time.