Country hopping

[Guest]

Hi there I'm wondering if anyone can share any info or give some advice on my situation. I moved to Australia 2 and a half years ago and was planning on applying for Australian citizenship later on in the year as my whole family has moved and is planning to stay permanently. However, I'm intending to move to the US next year as I'm getting married to an American citizen. Are there any laws against accquiring one residency after another? Does anyone know if I'm going to have more difficulty getting into the US because i only recently moved to Australia? And if I do renounce my Singapore citizenship, is there absolutely no chance of working/living in Singapore in the future??