Nation-states often struggled with disunity even after they consolidated power. Match each statement about challenges to national unity with the country it best describes.
a) Italy - Struggled with regional differences and regional identities.
b) India - Faced challenges due to linguistic and ethnic diversity.
c) Nigeria - Grappled with ethnic and religious divisions.
d) Belgium - Dealt with tensions between Dutch-speaking Flemish and French-speaking Walloons.