The First Crusade was highly successful, while the Second was not is correct .
This is a personal question, which means that only you can answer it. However, I can give some examples that might help guide your work.
An example of a primary source that you might encounter in your own life is that of a news article. As this article is likely to be written by a reporter witnessing the events, it can be considered a primary source. On the other hand, an example of a secondary source would be a non-fiction book that talks about a historical event. This is because such a book would give a second-hand account of an event based on historical information.
The Europeans in the Caribbean felt the need to bring in enslaved Africans as laborers because the native American Indian workers had become physically weak due to diseases and the Caribbean plantations were in requirement of stronger labor force. The Africans by birth were very strong and they as slaves would perfectly suit the needs of the Caribbean plantations.
The progressive reforms were prompted by the progressives who included men and women who fought against ruthless big business and corporations, trusts and political machines and called for reforms to combat the evils of child labor, poor working conditions, health and safety, squalid living conditions, the rights of women and minority groups, unfair business practices and consumer protection.
