All three countries now have their own legislatures because they have gained more political autonomy and have been granted devolved powers from the United Kingdom government. This allows them to make decisions on certain issues such as education, health, and transportation that are specific to their regions. This devolution of powers has helped to address regional differences and allow for more localized governance to better serve the people of Northern Ireland, Scotland, and Wales.
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Sure, the reason why Northern Ireland, Scotland, and Wales now have their own legislatures is because they have gained more political autonomy and have been granted devolved powers from the United Kingdom government.