How the day went downhill

What if your life changed within a few hours? What if you learn what it's like to lose? What if everything you ever did lead to this point of your life?
You are the country of (c/n), a former Spanish colony located in the Mediterranean Sea.
After gaining your independence, your country seems to be doing great, your economy was getting better with every year and your people were happy with their lives.Other countries were glad to trade food and other things with you.
But what if exactly that success causes an uprising empire to take interest in your country, wanting to take over your own?
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Quick note : I don't own anything except the plot