To cause a source to be biased means that it is influenced by your opinion or another factor that is not factual. Bias can take away from the credibility because it is not completely true, as a source should be.
Because of Marie Antoinette I think
In the Revolutionary War, the colonial forces had multiple advantages. For one, they were fighting on their home turf, so they were more familiar with their surroundings. Also, they cared more about what they were fighting for - to the British, this was a dumb war they were being forced to fight so close to the 7 Year's War and they didn't really care about keeping some irrelevant colony. The colonial forces used guerrilla warfare to fight the British as well, which disrupted their traditional military style.
<span>They were both founded in the first half of the 17th century and they both practiced some form of self-governance. They had very different climates, however, which meant that the Massachusetts economy was driven by things like shipping and shipbuilding while Virginia's warmer temperatures allowed for an agriculture-based economy.</span>
Grace period seems correct
