Why did the U. S annex Hawaii?

The first attempts of conquest undertaken in the 50s the nineteenth century, when it was intended to colonize them. In 1854, a treaty was negotiated on the connection of the islands to the United States. It has not been signed due to the death of the ruler of Hawaii Kamehameha III. In 1875, both sides signed a trade treaty. The Treaty was in force seven years, but in 1884 was signed the new, which is actually an extension of the previous (including that accompanied by the point of almost exclusive U.S. to Pearl Harbor). During this period, increased the settlement of Americans in Hawaii; They dominated the island's economy based on the cultivation and processing of sugar cane. Americans also began to take a position in the government.