Which of the following was a provision of the chinese exclusion act that affected chinese immigrants who were already in the united states?

indigenous people north and south were displaced, died of disease, and were killed by europeans through slavery, rxpe, and war. in 1491, about 145 million people lived in the western hemisphere. by 1691, the population of indigenous americans had declined by 90-95 percent, or by around 130 million people."

i think the answer is a and i hope this ; ))