St Patrick’s Day is embraced with gusto in the US. Like all of their favourite holidays, Americans celebrate with themed parades, house decorations and food.
St Paddy's momento for sale at a local supermarket. I believe that in Australia this stuff is commonly known as weeds, and concerted effort was put into it's removal from front lawns (when people had front lawns).
(apologies for dodgy photo, taken by stealth with my shoe phone)