How to get a FB ads report based on region?

In the reports, these things are included

Date: The date on which the activity reported by that row of the report took place. Please note that monthly reports will be dated on the first of each month and weekly reports will be dated on the Sunday that marks the beginning of the week.

Ad/Campaign Name: The name of the ad/campaign being tracked by that row.

Ad/Campaign ID: The unique ID number of the ad/campaign being tracked by that row.

Demographic: This is how he data is summarized for the current row you’re looking at. For instance, if it says "gender_age," then this row will tell you about how a certain gender and age respond to your ad. Other options include "country" (partitioned by country) and "region" (partitioned by states or regions within countries).

Bucket 1/Bucket 2: These columns give further information about what demographic is being reported in the row. The values in these columns depend on the value of "demographic" column in the row. For instance, if the row is a "gender_age" row, these columns will give you information about what gender and what age is being reported. However, if the row is a "region" row, it will tell you what country and what state is being reported.

% of Clicks (CTR): The percentage of unique user clicks served to the demographic reported, as compared to the total number served.

% of Impressions: The percentage of unique user impressions served to the demographic reported, as compared to the total number served. Note that this column may be blank if there were not a sufficient number of impressions served to this group. We do this to protect the privacy of people who use the site, and it doesn't necessarily mean that 0 impressions were served to this demographic.

You can view the ad reports according to Demographic.