Jobs of the local population. Moreover some immigrants, in particular the "illegal" ones, work without a contract and accept a lower salary and working conditions than other workers. This may contribute to lower wages

Illegal immigration should be banned
For:

• 
  Some argue that immigrants take the jobs of the local population. Moreover some immigrants, in particular the "illegal" ones, work without a contract and accept a lower salary and working conditions than other workers. This may contribute to lower wages in the country.
  
• 
  Illegal migration is often associated with problems such as prostitution, slavery, and violence. There are many criminal gangs that exploit those willing to do whatever it takes to reach the land of their dreams. Sometimes these gangs abuse the migrants even after they have arrived to the destination country.
  
• 
  Problems of adaptation and nationalism. Immigrants do not always adapt well to the culture of their host country and sometimes tensions emerge. Nationalism also makes people in the destination countries sometimes feel their ways of life and culture are somehow threatened. 
  
  • 
    Legal immigrants would be discouraged to obey the legal immigration pathways
    
  • 
    Take the examples of sweden, germany and Turkey
    

Against:

• 
  Migrants tend to be young people of working age and highly motivated. They provide manpower for destination countries, sometimes doing the jobs that the locals are not willing to do. The US, one of the most prosperous countries in the world, owes its fast development to waves of immigrants from many parts of the world. According to a recent study published in Science Advances, refugees are not a burden to the economy of the recipient countries and more than compensate the costs incurred by host countries.
  

The economic benefits of illegal immigration are greater than the costs of the public services utilized, according to an expert at Rice University’s Baker Institute for Public Policy.Indeed, for every dollar the Texas state government spends on public services for undocumented immigrants, new research indicates, the state collects $1.21 in revenue
IN FREE MARKET ECONOMY MARKET ITSELF DECIDES WHAT ARE THE WAGES. Critics of illegal immigration have long argued that undocumented immigrants who pay taxes are able to do so because they’re using stolen Social Security numbers. But millions of federal tax dollars are paid every year by people who don’t have Social Security numbers at all.
Instead, they file using what’s known as an Individual Taxpayer Identification Number (ITIN).
The Bipartisan Policy Center, a Washington-based think tank, notes that “most experts believe the vast majority of tax returns filed with ITINs today are filed by undocumented immigrants.”
Some noncitizens who legally immigrated to the United States also pay taxes using this method.
In 2019, according to the IRS, more than 2.5 million tax returns were filed using ITINs, accounting for nearly $6 billion in taxes.

• 
  The population in some of the recipient countries, in particular in Europe, is ageing quickly. Migrants may contribute to the long term sustainability of the pension system in these countries.Immigrants are also consumers and thus contribute to the growth of local industries
  
• 
  Migrants help develop their countries of origin. In 2015 it migrants sent approximately to developing countries $440 billion. Moreover, developing countries with limited resources and a high birth rate could struggle to provide goods and services for a fast growing population. Migration serves the to alleviate some of these problems.
  

• 
  The problem in europe mostly caused by refugee crises . And they are fleeing the african countries mostly. 14 central and western african countries are under the indirect rule of france because of the CFA frank. So the people in these countries are living in extreme poverty. So the solution is not to deport the immigrants but to liberate african countries from certain european neoimperialists.