A hero is someone who sacrifices himself for a greater cause.
Explanation:
The sentence topic is an important structure that helps make the paragraph of argumentation much more organized and interesting. It allows the author of the text to develop the subject more easily, ensuring the success of the essay. In other words, a topic sentence is the central or core idea of the development paragraph, that is, it is a summary of the point of view that the text will address.
Based on this, we can conclude that the phrase "A hero is someone who sacrifices himself for a greater cause" is an example of a topic sentence that will establish a relationship with the other sentences that will support the message that is being passed
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He was describing the California dream which he referred to as a paradox of expectations.
He pointed out that the expectations of millions of people who migrate into California was raise as a result of the promises of the California Dream. He noted that these people hope that they will have a better life in California than the lives they had in their past.