Frederick T. Frelinghuysen replaced him at the end of 1881, the conference efforts lapsed. Frelinghuysen also discontinued Blaine's peace efforts in the War of the Pacific, fearing that the United States might be drawn into the conflict. Arthur and Frelinghuysen continued Blaine's efforts to encourage trade among the nations of the Western Hemisphere; a treaty with Mexico providing for reciprocal tariff reductions was signed in 1882 and approved by the Senate in 1884. Legislation required to bring the treaty into force failed in the House, however, rendering it a dead letter. Similar efforts at reciprocal trade treaties with Santo Domingo and Spain's American colonies were defeated by February 1885, and an existing reciprocity treaty with the Kingdom of Hawaii was allowed to lapse. The 47th Congress spent a great deal of time on immigration, and at times was in accord with Arthur. In July 1882 Congress easily passed a bill regulating steamships that carried immigrants to the United States. To their surprise, Arthur vetoed it and requested revisions, which they made and Arthur then approved. He also signed in August of that year the Immigration Act of 1882, which levied a 50-cent tax on immigrants to the United States, and excluded from entry the mentally ill, the intellectually disabled, criminals, or any other person potentially dependent upon public assistance. A more contentious debate materialized over the status of Chinese immigrants; in January 1868, the Senate had ratified the Burlingame Treaty with China, allowing an unrestricted flow of Chinese into the country. As the economy soured after the Panic of 1873, Chinese immigrants were blamed for depressing workmen's wages; in reaction Congress in 1879 attempted to abrogate the 1868 treaty by passing the Chinese Exclusion Act, but President Hayes vetoed it. Three years later, after China had agreed to treaty revisions, Congress tried again to exclude working class Chinese laborers; Senator John F. Miller of California introduced another Chinese Exclusion Act that blocked entry of Chinese laborers for a twenty-year period. The bill passed the Senate and House by overwhelming margins, but this as well was vetoed by Arthur, who concluded the 20-year ban to be a breach of the renegotiated treaty of 1880. That treaty allowed only a "reasonable" suspension of immigration. Eastern newspapers praised the veto, while it was condemned in the Western states. Congress was unable to override the veto, but passed a new bill reducing the immigration