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Primary sources can be described as those sources that are closest to the origin of the information. ...Secondary sources often use generalizations, analysis, interpretation, and synthesis of primary sources. Examples of secondary sources include textbooks, articles, and reference books.
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This poem, "A Child's Garden of Verses" expresses the problem many people have with getting up when it is dark in the morning and going to bed in the evening when it is still light outside. Then, in "When We Were Very Young" Children, unlike their parents, tend to embrace verse with fierce and unembarrassed joy.
I don't know if it helped, sorry if not...
The main reason for this was slavery. The US did not want to annex Texas because doing so would have upset the balance between slave states and free states that had been accomplished with the Missouri Compromise of 1820. When Texas became independent, it wanted to join up with the United States.