Countries were globalizing causing the world to change from large to medium because of it
The first year that had an Earth day was 1970. Earth day is to get people to cut down on pollution and recycle. It is to overall treat the earth better.
The United States gained control of Texas after armed conflict with the forces of "<span>B. Antonio López de Santa Anna," since this was during a major territorial conflict with Mexico. </span>
If the movie is perhaps a documentary, then it is telling you factual information of actual events (includes pictures or pictures of actual documents or events); this makes it a primary source.
If the movie is based off of real events, has factual information, but also has added information to create a well-rounded plot, this makes it a secondary source.