I am a little bit inbreed if my ethnicity was bottlenecked?

The bottleneck effect is an extreme form of genetic drift that occurs when a population's size is dramatically reduced, often by a natural disaster or human activity. This event drastically shrinks the gene pool, leading to a loss of genetic diversity among the surviving individuals. The surviving population, a random sample of the original, may have significantly different allele frequencies, making the population more vulnerable to disease and environmental changes.