The poet writes the poem in English and Spanish to reach a wider audience and pay greater attention to the cause he is presenting.
The textual evidence that can confirm that women are crossing the border illegally is the line that shows that the bus was blocked.
The people who blocked the bus are US immigration officials.
The women's journey was very difficult, both to enter the US and to stay in that country, as they faced prejudice and racism from many people and had difficulty adapting to American society, in addition to not having enough resources to remain in the US. healthy conditions.

We can arrive at this answer because:

The author wants to highlight the hard life of illegal immigrants, especially those of Spanish origin, who are trying to follow the American dream and have a better life in the US.
These sufferings begin during attempts to cross the country's borders and the dangers that follow before and after that.
To show both the American and Hispanic audiences just how complicated this situation is, the author wanted to write the poem in two languages.