MEI (MEI) is a global concern in achieving sustainable development (SD), which is trending due to ethnic and population diversity. By applying the Legal Rights Theory (LRT), statistics say that political and civil rights policies under the LRT are the two most promising attributes that promote and help MEI and SD globally. However, government stability and economic prosperity (EcP) must be associated with them. Moreover, political integration (PoI) and assistance are not directly effective in supporting MEI globally, nor does the presence of PoI significantly affect the MEI and progression of SD. At the same time, focusing on the income categorization of the countries under the influence of PoI, lower‐middle‐income countries are adversely affected, further fragmenting the societies and creating a hurdle in achieving SD. It concludes that in promoting MEI, governments should focus on legal rights policies and adapt the MEI policies of Singapore, China, and other EU countries for Agenda 2030.