The first argument you made was really solid, as you researched not only the claim, but also the historical development of the main subject of the claim (boxing). This helps paint a larger picture of the history of the sports movement. However, while you say you trust the source because of the "dates and facts" they included, you make no mention of fact checking these dates and facts. To properly fact check, it may be beneficial to find evidence in regards to any specifics of the article mentioned. Additionally you state you "do not know much" about your second article, so you can not attest to its credibility. Next time, you may want to learn more about the source before using it. For instance, after researching I found that the website surrounds "people, food, travel, history, and culture" in Texas. Thus, it is most likely trustable since this event you mentioned took place in Texas.