1. The cotton industry had entered a boom period

2. Angelos wanted to dominate the South Texas elite.
3. The arrival of Angelos began to disrupt a Tejano social system based on ranching.

To understand the context and meaning behind these statements, it is important to have some background knowledge about the cotton industry and the social dynamics in South Texas during the time discussed.

1. The cotton industry had entered a boom period:
To understand the reasons behind the boom period in the cotton industry, you can start by researching historical events, technological advancements, and economic factors that might have contributed to its growth. Look into factors such as the Industrial Revolution, inventions like the cotton gin, availability of fertile land, climate conditions, and demand for cotton products both domestically and internationally.

2. Angelos wanted to dominate the South Texas elite:
To understand the motivations and ambitions of Angelos in wanting to dominate the South Texas elite, it would be helpful to gather information about who Angelos was, what his background was, and what his means of influence or power were. Read about his life, achievements, and any specific events or actions that might provide insight into his desire for dominance.

3. The arrival of Angelos began to disrupt a Tejano social system based on ranching:
To understand how Angelos's arrival disrupted the Tejano social system based on ranching, you can start by researching the social structure and dynamics of the Tejano community in South Texas during that time. Learn about their economic activities, cultural practices, and social organization related to ranching. Additionally, gather information about Angelos's role in this disruption, such as his actions or policies, any conflicts or tensions that arose, and the implications it had for the Tejano community.

By conducting research and reading historical accounts, articles, books, or other relevant sources, you will be able to better understand the historical context and implications of these statements. Remember to critically evaluate your sources, cross-reference multiple accounts if possible, and consider different perspectives to gain a comprehensive understanding.