What did constantine build that contributed to the success of constantinople

Answer

Although some historians disagree (claiming Constantine laid the foundation), he is credited with building the first of three Hagia Sophias, the Church of Holy Wisdom, in 360 CE. The church would be destroyed by fire in 404 CE, rebuilt by Theodosius II, destroyed and rebuilt again under Justinian in 532 CE.

the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.