Both affected and effected are verb forms and their usage can get confusing. Effected means executed, produced, or brought about. To effect is to bring about or cause something to happen. For example, The dictatorial regime quickly effected changes to the constitution that restricted the freedom of the people.

On the other hand, affected means made an impact on. It is the past tense of the verb form of affect, which means to impact. For example, Carbon di-oxide emissions affected the environment.

So we can say that "The dictatorial regime quickly effected changes to the constitution that affected the freedom of the people."

See also: Affect vs Effect

Comparison chart

Affected versus Effected comparison chart
Edit this comparison chartAffectedEffected
Meaning "Affected" means "impacted, created an effect on, changed in a certain way." "Effected" means "executed, brought about, produced something."
Example The BP oil spill adversely affected marine wildlife in the Gulf of Mexico and surrounding areas. After the BP oil spill, the government effected [i.e., brought about, executed] sweeping environmental regulation.


Usage Tip

Something that already exists can be affected; but things that are effected must usually be brought into existence.


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"Affected vs Effected." Diffen LLC, n.d. Web. 15 Jan 2019. < >