Although he declined the post of Secretary of the Navy in the Rutherford B. Hayes administration, Senator Hale performed constructive work of the greatest importance in the area of naval appropriations, especially during the early fights for the "new Navy." "I hope", he said in 1884, "that I shall not live many years before I shall see the American Navy what it ought to be, the pet of the American people." Much later in his career, he opposed the building of large numbers of capital ships, which he regarded as less effective in proportion to cost and subject to rapid obsolescence.
Senator Hale retired from politics in 1911 and spent the remainder of his life in Ellsworth, Maine, and in Washington, D.C., where he died.
Just as he had worked closely with Tom Reed in the House, Curtis became a chief lieutenant for Senator Aldrich.
Then in his last years in the Senate, and having outlasted his most powerful allies, Aldrich came to rely on a group of younger, high-tariff colleagues, including Curtis, W. Murray Crane of Massachusetts, EugeneHale of Maine, and Reed Smoot of Utah.
In 1909, Curtis played an influential role in the passage of the Payne-Aldrich Tariff, which raised rates so high that it helped split the Republican party into warring conservative and progressive factions.