During this time, The US is trying to expand its borders, with all the talk about new states coming into the Union what is the main issue people are worried about? more land reaching the pacific ocean everyone speaking english slavery

1. Identify the context: The question refers to a time when the United States was expanding its borders and incorporating new states into the Union. 2. Analyze the options: - **more land:** While territorial expansion was occurring, the concern was not merely about acquiring more land. - **reaching the pacific ocean:** Although reaching the Pacific had strategic value (especially in terms of trade), it was not the central issue causing worry. - **everyone speaking english:** There was no significant historical worry about language uniformity during this period. - **slavery:** The expansion of the Union raised major debates and conflicts about whether new states and territories would allow slavery. This was the primary and most contentious issue that divided the nation. 3. Conclusion: The main issue people were worried about was that the expansion would affect the balance and future of slavery in the United States. Final answer: \( \textbf{slavery} \).