Why did John Hay send the European powers and Japan the Open Door notes?

On September 6, 1899, US Secretary of State John Hay sent notes to the major powers (France, Germany, Britain, Italy, Japan, and Russia) to ask them to declare formally that they would uphold Chinese territorial and administrative integrity and they would not interfere with the free use of the treaty ports

Explanation:

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.