The Islam religion covers millions of people and dozens of cultures and countries. It all depends of the culture and the rules of a country.
rich
It all depends on the society around the place/community. In some cultures and religion (Islam as example), to have more than one wife is accepted (the rule is that You have to have the economy to have more than one wife, and the maximum is 4, but you can read more about that another time). While in western countries, having more than 1 wife is "abnormal". It can also be like the hijab. For the Islamic countries, it is seen as 'normal' to wear it, while in some other countries it is "abnormal".
No state allows a man to have more than one wife.
You are a shallow person and find women that are prettier than your wife (even your sister) to be far more attractive. You feel cheated that your wife is not more attractive than your sister and this is simply immature. What you have not done is look into the soul of your wife to see what a loving; kind and loyal person she really is. Looks fade very quickly, so a woman better have a good personality.
They might think of the bad things.
The husband was with his family more than his wife
In the US you can only be legally married to one person at a time. If a previous marriage is not legally dissolved any subsequent marriage(s) are not legal. In the US to be "legally" married to more than one person at a time constitutes the crime of bigamy.
No they do not allow men to have more than one wife.
It was never legal to have more than one wife in England.
Who dosent marry morer than one person theese days
They might think of the bad things.
From an Islamic perspective, there is a difference between adultery and having more than one wife. Adultery is having an illicit relationship with a person married to someone else whereas having more than one wife is polygamy. Polygamy is not against the laws of God. In the Bible there are many instances of polygamy. Prophet Abraham (may peace be upon him) had two wives. The Koran says that a man can marry up to four women but if he feels that he cannot deal justly with them all (which you mostly can't), it commands you to marry only one.