The Japanese objected to the exclusion law of 1924 basically because it was aimed at them directly, and not at immigrants in general. They were being singled out for mistreatment, they felt.
These early books seemed to love having lots of tables, charts, graphs, etc. This one compares the marriage rate of Chinese and Japanese. As of 1920, it appears that only about 12% or so of the Chinese have wives with them. At them same time, almost 70% of the Japanese did. You can also notice the swift growth in the Japanese married-with-wives-there rate.
The thing to keep in mind about this is that, with wives there, the possibility of having children increased, and this fed into the anti-Japanese prejudice with some saying that they were out-breeding the white people and would take over entire areas.
The author goes on to talk about how the Japanese businesses changed over time. As more Nisei took on the attitudes of Americans, they wanted more of the American-type goods and less of the Japanese goods. This had a negative effect on some Japanese businesses that had developed. The staying-to-themselves aspect of immigration was starting to fall apart as the Nisei looked more outside their own community for things.
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