The Malaysia Agreement edit
The Malaysia Agreement was an agreement signed by Sabah, Sarawak, Singapore and Malaya. It merged all the members together as a single country - Malaysia. At first, Brunei also wanted to sign the Agreement but at last they decided not to as there were problems to the position of the Sultan of Brunei and money.
Singapore was kicked out at last from Malaysia in 1965. All the other countries are still part of Malaysia.