Final answer:
Caucasians have the highest rate of Alzheimer's disease.
Step-by-step explanation:
The racial group with the highest rate of Alzheimer's disease is Caucasians. According to the provided information, Alzheimer's disease is the most common cause of dementia in the elderly, and one in every eight people age 65 or older has the disease. Additionally, it is projected that there will be as many as 13 million Alzheimer's patients in the United States by the year 2050 due to the aging population.