In what year? There were many years where nothing was in common at all and now there is most everything in common
Answer:
Bad attitude.
Explanation:
The attitudes and politics of Americans toward immigration in the 1920s was not good because Americans thought that these immigrants increase unemployment as well decreases the wages. Many Americans feared that there was high unemployment rate in America after World War I. New immigrants were used to break strikes and were blamed for the deterioration in wages so we can say that Americans attitudes turns bad due to the above factors,
The Indian Appropiation Act contained several acts enacted by the US Congress between the late 19th century and the early 20th century.
One of the most outstanding acts was the Indian Appropriations Act from 1871. According to it, Indians would not be treated anymore as an "independent nation, tribe, or power". In turn, Indians would be considered as "wards" of the federal goverment. This provision considers Indians somehow like children, as if they needed a tutor.
From this moment onwards, the US goverment did not have to mantain endless negotiations to sign treaties with the different Indian tribes. Also treaties that had been signed before the Act were not enforceable anymore.
The act made much easier for the US government to exercise control over lands which were previously dominated by the Indians.