Start the video at the 4:24 mark(Only the second half of the cartoon matters)
If this video doesn't work here is the youtube link
Hopefully the video works for your to watch.
While it is just a cartoon about Donald Duck it does a great job of showing an idea about history. The phrase "snowball effect" comes from something very similar to what Donald showed in this cartoon. Once a snowball starts rolling it begins to get larger and larger and larger. Before you know it, it is an out of control ball. In history we see similar things take place. What starts as a small incident, leads to larger and larger and larger problems. The first big "snowball" we will see this year will lead to the beginning of America starting as a country. The reading you have "widening split" describes this in another way. A split is obviously a separation between two things. A widening split means those two things are growing further and further apart. The two things in this particular case and Great Britain and it's colony America. There are many things that happen that lead America to eventually decide to break free. You are going to begin to look at some of those reasons.
Quickwrite # 3-Come up with an example of when a snowball effect situation has happened or could happen in your own life? (An example: From history the great awakening and enlightenment leads to questioning British controlling their life, which leads to frustration from the 7 years war, which leads to taxes, which leads to the boston tea party, which leads to stricter rules, which leads to declaration of independence. One thing leads to another and it gets bigger and bigger and bigger)
In case it is needed below is the reading and questions:
Widening Split Reading
Questions for reading