Passage: On 10 February 1972, Ras al-Khaimah, under the leadership of Sheikh Saqr bin Mohammad al-Qasimi, joined the United Arab Emirates.\n\nQuestion: Based on this passage, when did ras al khaima join the emirates?
Please answer the following question by reasoning step-by-step.
10 February 1972
This is the relevant information: On 10 February 1972, Ras al-Khaimah, under the leadership of Sheikh Saqr bin Mohammad al-Qasimi, joined the United Arab Emirates.

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Final answer: 10 February 1972