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public static void flagOfLiberia(Graphics g) {
    Expo.setBackground(g,Expo.black);
    for (int d = 1; d <= numDots; d++) {
        int x = Expo.random(0,1000);
        int y = Expo.random(0,650);

        if (x < 300 && y < 300)
            Expo.setColor(g,Expo.darkBlue);
        else if (y % 100 < 50)
            Expo.setColor(g,Expo.red);
        else
            Expo.setColor(g,Expo.white);
        
        drawDot(g,x,y);
        Expo.setColor(g,Expo.white);
        Expo.fillStar(g,150,150,100,5);
    }
    showName(g,"Liberia");
}

The above should be at least a little improvement. I used a modulus (%) to check every multiple of 100, seeing if the remainder is less than or greater than 50. If you desire a cutoff at 650, then a single if statement can be added before the modulus to check that y is below the threshold.