Some of the factors suggested as causes of the gender imbalance are sex-selective abortion and infanticide, large-scale migration, and behavioral factors statistically linked with sex, such as excessive drinking and violence [59]). Gender imbalance may result in the threat of social unrest, especially in the case of an excess of low-status young males unable to find spouses,[60] and being recruited into the service of militaristic political factions. Economic factors such as male-majority industries and activities like the petrochemical, agriculture, engineering, military, and technology also have created a male gender imbalance in some areas dependent on one of these industries.[61]